/**
  ******************************************************************************
  * @file    WWDG/WWDG_Example/main.c
  * @author  MCD Application Team
  * @version V1.5.2
  * @date    30-September-2014
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8l15x.h"
#include "stm8_eval.h"

/** @addtogroup STM8L15x_StdPeriph_Examples
  * @{
  */

/** @addtogroup WWDG_Example
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define WINDOW_VALUE        97
#define COUNTER_INIT       104

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO FunctionalState NonAlowedRefresh = DISABLE;
__IO FunctionalState AllowedRefresh = ENABLE;
uint8_t Index;
/* Private function prototypes -----------------------------------------------*/
static void WWDG_Config(void);
void Delay (uint16_t nCount);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
void main(void)
{

    /* Initialize LED1 and LED2 mounted on STM8L152X-EVAL board */
    STM_EVAL_LEDInit(LED1);
    STM_EVAL_LEDInit(LED2);

    /* Initialize Key and Joystick down push-buttons mounted on STM8L152X-EVAL board */
    STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
    STM_EVAL_PBInit(BUTTON_DOWN, BUTTON_MODE_EXTI);

    /* enable interrupts */
    enableInterrupts();

    /* Check if the MCU has resumed from WWDG reset */
    if (RST_GetFlagStatus(RST_FLAG_WWDGF) != RESET)
    {
        /* WWDGF flag set */
        /* Toggle LED1 */
        for (Index = 7; Index != 0; Index--)
        {
            STM_EVAL_LEDToggle(LED1);
            Delay(0x7FFF);
        }
        /* Clear WWDGF Flag */
        RST_ClearFlag(RST_FLAG_WWDGF);
    }

    /* WWDG Configuration */
    WWDG_Config();

    while (1)
    {
        /* Check if WWDG counter refresh is allowed in Allowed window */
        if (AllowedRefresh != DISABLE)
        {
            /* get WWDG counter value */
            /* wait until WWDG counter becomes lower than window value */
            while ((WWDG_GetCounter() & 0x7F) > WINDOW_VALUE);
            /* Refresh WWDG counter during allowed window so no MCU reset will occur */
            WWDG_SetCounter(COUNTER_INIT);
        }

        /* Check if WWDG counter refresh is allowed in non Allowed window */
        if (NonAlowedRefresh != DISABLE)
        {
            /* wait until WWDG counter becomes higher than window value */
            while ((WWDG_GetCounter() & 0x7F) < WINDOW_VALUE);
            /* Refresh WWDG counter during non allowed window so MCU reset will occur */
            WWDG_SetCounter(COUNTER_INIT);
        }
        /* Toggle LED2 */
        STM_EVAL_LEDToggle(LED2);
        Delay(0x6FFF);
    }
}

/**
  * @brief Configures the WWDG to generate a Reset if the WWDG is not refreshed
  *         during the correct window.
  * @param  None
  * @retval None
  */

static void WWDG_Config(void)
{
    /* WWDG configuration: WWDG is clocked by SYSCLK = 2MHz */
    /* WWDG timeout is equal to 251,9 ms */
    /* Watchdog Window = (COUNTER_INIT - 63) * 1 step
                       = 41 * (12288 / 2Mhz)
                       = 251,9 ms
    */
    /* Non Allowed Window = (COUNTER_INIT - WINDOW_VALUE) * 1 step
                          = (104 - 97) * 1 step
                          =  7 * 1 step
                          =  7 * (12288 / 2Mhz)
                          =  43.008 ms
     */
    /* So the non allowed window starts from 0.0 ms to 43.008 ms
    and the allowed window starts from 43.008 ms to 251,9 ms
    If refresh is done during non allowed window, a reset will occur.
    If refresh is done during allowed window, no reset will occur.
    If the WWDG down counter reaches 63, a reset will occur. */
    WWDG_Init(COUNTER_INIT, WINDOW_VALUE);
}

/**
  * @brief  Inserts a delay time.
  * @param  nCount: specifies the delay time length.
  * @retval None
  */
void Delay(__IO uint16_t nCount)
{
    /* Decrement nCount value */
    while (nCount != 0)
    {
        nCount--;
    }
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
    /* Infinite loop */
    while (1)
    {}
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
